An ugly prank played after camping with one's best friend or girlfriend and eating a generous amount of grilled hot dogs or Brats. The pair hike to a nearby summit (preferably one of 8000' or more). Once at the summit and both persons are ready to expel the winers, the prankster takes initiative to find a viewable open location to do the deed. The prankster drops his/her pants whilst yelling to the prankee to look towards their bare ass, which should then be blowing mud toward the prankee as they look over. Hence the Filthy Mountaineer.
We hiked and hiked. Suddenly, I really had to go shit so I dropped my pants in front of Cindy and gave her a Filthy mountaineer!
by J>C>B March 5, 2008

Ever since Nancy got that red eye, she's been afraid to take it on the face. now that she has goggles she wants the filthy Phelps all the time.
by pee didddy May 7, 2010

a "dirty" martini made with Grey Goose Brand Vodka mixed with olive brine. Garnished with 3 olives. Shaken, not stirred. (See also-dirty kettle: made with Kettle One Brand Vodka)
Hey Susan, would you care to join me at the Top of the Mark for a filthy goose? But of course Chris...vamanos!
by Mr. Lane "Dyogi" Mayer October 15, 2003

Bro that filthy Kevin had me so fucked up last night, I woke up halfway across nassau county wearing only a cowboy hat and my nikes
by Lilwaynefan101 October 23, 2019

by davep3rrett November 4, 2011

After a few minutes, I realize I'm about to blow it out of both ends...there it was, my first filthy release. It nearly shot her across the room.
by Tellydude September 20, 2016

When you pour lukewarm soup into a chick's vagina who is having her period, and then proceeds to consume the succulent stew.
by WeedThenWang November 4, 2009
